Alapati Hemalatha

Handling JSON in Java can be done using Jackson, Gson, or org.json.

• Jackson (best for large projects): Use ObjectMapper to parse JSON into Java objects.

  ObjectMapper objectMapper = new ObjectMapper();
  User user = objectMapper.readValue(json, User.class);
  

• Gson (lightweight): Use Gson to convert JSON to objects.

  Gson gson = new Gson();
  User user = gson.fromJson(json, User.class);
  

• org.json (manual handling): Parse JSON using JSONObject.

  JSONObject obj = new JSONObject(json);
  String name = obj.getString("name");
  

Jackson is the most powerful choice.

Yes, structs can have methods in C++, C#, and even C (with function pointers), but their behavior differs:

C (No Direct Methods)

• C structs cannot have methods, but function pointers can be used as a workaround.

C++ (Structs Can Have Methods)

• C++ treats structs like classes (default access is public), allowing methods, constructors, destructors, and operator overloading.

C# (Structs Can Have Methods)

• C# structs support methods, properties, and constructors (except parameterless constructors). They cannot inherit from classes but can implement interfaces.

Summary

• C: No direct methods, but function pointers can be used.
• C++: Structs behave like lightweight classes and support methods.
• C#: Structs can have methods, properties, and constructors, but no inheritance from classes.

Each language uses structs differently based on its design principles.

Key Differences Between class (C++/Java) and struct (C#)

Summary:

• Use class when you need object-oriented features like inheritance, polymorphism, and heap allocation.
• Use struct in C# for small, simple data types that don’t need inheritance and benefit from stack allocation. 

Key Differences Between Java and C

👉 In short: Java is easier, safer, and portable, while C is faster, low-level, and powerful for system programming.

Java Spring is superior to Enterprise Java Beans (EJB) because:

1. Lightweight – Spring has minimal overhead, while EJB requires heavy configurations and an application server.
2. Easier to Use – Spring’s dependency injection and annotations simplify development, whereas EJB is complex.
3. Flexible – Spring works with plain Java objects (POJOs) and integrates easily with other frameworks.
4. Better Performance – Spring avoids EJB’s container-managed overhead, making it faster.
5. Modular – Developers can use only needed Spring modules, unlike EJB, which is tightly coupled.

Spring provides a more modern, efficient, and developer-friendly approach than EJB